Electricity: measuring and testing – Magnetic – Magnetic sensor within material
Patent
1986-09-11
1988-09-20
Strecker, Gerard R.
Electricity: measuring and testing
Magnetic
Magnetic sensor within material
33178E, 73623, 74 8915, 92 31, G01N 2790, G01N 2906, F01B 300
Patent
active
047728493
ABSTRACT:
A probe (10) for longitudinally traversing and circumferentially inspecting the interior of a tube. A rotating sensor containing head (44) is driven by a rotor (40) extending from the end (38) of a cylindrical housing (12) in which it is mounted. The axially fixed rotor (40) surrounds and is driven by a helix drive connection (70) to a piston extension (32). The piston (20) reciprocates in a cylindrical chamber (14) within the housing (12) in response to selectively applied fluid pressure acting against a spring bias (60). A strain gage (62) on the spring (60) controls the fluid pressure by means of valve (2) whereby reciprocation of the piston (20) and its extension (32) rotates the rotor (40) by means of the helical groove (70) and balls (72). The various parts are hollow to accommodate the necessary wire conductors (51 and 64) and H.sub.2 O.
REFERENCES:
patent: 965009 (1910-07-01), Philbrick
patent: 2036582 (1936-04-01), Kollsman
patent: 2684464 (1954-07-01), Hastings et al.
patent: 3551931 (1971-01-01), Monroe et al.
patent: 3831084 (1974-08-01), Scalese et al.
patent: 4438399 (1984-03-01), Schnabl et al.
patent: 4441078 (1984-04-01), Lecomte
patent: 4625165 (1986-11-01), Rothstein
Combustion Engineering Inc.
Mulholland John H.
Strecker Gerard R.
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